Researchers examining 84,730 people who underwent inpatient surgery at 186 hospitals from 2005 to 2007 found that death rates varied widely from hospital to hospital, from 3.5% to 6.9%. But complication rates did not vary significantly: 24.6% of patients at the high-death hospitals experienced complications after surgery, compared with 26.9% of the patients at the hospitals with the lowest death rates. The discrepancy suggests that how a hospital responds to complications may be even more important than the frequency of complications, according to the report prepared by the Michigan Surgical Collaborative for Outcomes Research and Evaluation.